Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5768349 | Voice mail telephone answering device | Stephen B. Knuth, Mark J. Karnowski | 1998-06-16 |
| 5588046 | Digital telephone answering device and method of testing message storage memory therein | Stephen B. Knuth, Mark J. Karnowski | 1996-12-24 |
| 5577104 | Method for system and message activation based on distinctive ringing | Stephen B. Knuth, Mark J. Karnowski, James W. Mazzolini | 1996-11-19 |
| 5400393 | Voice mail digital telephone answering device | Stephen B. Knuth, Mark J. Karnowski | 1995-03-21 |